I’m getting very good results with an RTL-SDR Blog v3 dongle with bias-T enabled and an RTL-SDR Blog 1090 triple-filtered LNA near mt antenna (with 12 meters of LMR-240 coax in between plus three 30cm lengths of RG-316 jumpers, one between the antenna and LNA, one between the LNA and the LMR-240, and one between the other end of the 240 and the dongle.)
ADSB Exchange also sells a (blue) SDR dongle that has an LNA and 1090 filter and I believe is currently in stock, if you’re interested and if the FlightAware Pro Plus blue can’t be obtained right now.